Kentucky Nature Preserves Rare Plants

Kentucky State Nature Preserves Commission

Small Yellow Lady's-slipper
Cypripedium parviflorum
Family: Orchidaceae

Protection Status:
State Status:  T
USFWS Status: {null}

Global Rank: G5
State Rank: S2

Bogs, mossy swamps and woods, wet shores; in KY, rich mesic forested slopes.

Species Description:
Perennial herb, orchid.

Flowering Period: Mid April to late June.

Additional Information at NatureServe

Diagnostic Characteristics:
There are more than 2 leaves on variety parviflorum and they are distributed on the stem. The lip of the flower is yellow and 2-3 cm long. The lateral petals are dark purple (red-brown). The plants are found in low wet sites. The more common yellow lady-slipper, variety pubescens , has a larger pouch (3-5 cm).

Exotic pest plants are a threat to this species. Species is sensitive to changes in moisture/hydrologic conditions. Changes could result from overstory removal, stream/wetland alteration, impacts due to erosion, trail or road construction or other disturbance to the forest.

Global Range:
Alaska to Nova Scotia, south to Nebraska and Georgia. This is a widespread species complex whose taxonomy is being revised. The global range of the subspecies found in Alaska cannot now be determined with confidence from the literature.

Known Kentucky Occurrences:

Note: To print pages from this site change Page Setup to Landscape
Data last updated: Wednesday, May 28, 2014
Kentucky State Nature Preserves Commission
801 Teton Trail
Frankfort,KY 40601
Phone: (502) 573-2886
Fax: (502) 573-2355
Copyright © 2003-2013 Commonwealth of Kentucky. All rights reserved.